#!/usr/bin/env python
# Copyright 2021-2024 The PySCF Developers. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Author: Xing Zhang <zhangxing.nju@gmail.com>
#

from pyscf.pbc.grad import uhf


class Gradients(uhf.Gradients):
    '''Non-relativistic Gamma-point unrestricted Kohn-Sham DFT gradients'''

    grids = None

    def get_stress(self):
        from pyscf.pbc.grad import uks_stress
        return uks_stress.kernel(self)
